JP4665527B2 - Display device and display control method - Google Patents

Description

  The present invention relates to a display device and a display control method, and more particularly to a display device and a display control method that enable a smooth image to be displayed.

  In display devices such as a liquid crystal display, a plasma display, an organic EL (Electro Luminescent) display, and a field emission display, the shape and display position of a pixel are fixed. In such a display device, high-definition image display is realized by reducing the size of a pixel cell formed of a semiconductor by miniaturization of the semiconductor.

  However, in order to miniaturize a semiconductor, it is necessary to invest a very large amount of development funds and a large amount of capital investment. The pixel cell includes a light emitting unit that emits light and a circuit unit that drives the light emitting unit. In general, it is difficult to make the circuit portion smaller than a predetermined size. Therefore, when the size (area) of the pixel cell is small, the aperture ratio, which is the ratio of the area of the region through which the light of the light emitting portion is transmitted, to the size of the pixel cell is reduced. As a result, the luminance of light displayed by the pixel cell is reduced.

  Therefore, in recent years, display devices display high-definition images by separately driving the sub-pixels that display red, the sub-pixels that display green, and the sub-pixels that display blue that constitute the pixel cell. Is realized.

  FIG. 1 is a diagram illustrating the shape of a pixel cell constituting a display device such as a conventional liquid crystal display or plasma display. In the figure, R, G, and B represent red, green, and blue, respectively. This also applies to FIGS. 4 and 5 described later.

  In FIG. 1, a pixel cell 1 is composed of rectangular sub-pixels 11 to 13 having the same size (size). The subpixel 11 displays red, the subpixel 12 displays blue, and the subpixel 13 displays green. As shown in FIG. 1, in the pixel cell 1, subpixels 11 to 13 are arranged in the order of the subpixel 11, the subpixel 12, and the subpixel 13 from the left side in the drawing, and this arrangement is arranged as an RGB stripe. This is called an array. In FIG. 1, each of the subpixels 11 to 13 has a horizontal (horizontal) length of 1 and a vertical (vertical) length of 3, and each subpixel 11 to 13 has an area (size). Are all 3 (= 1 × 3).

  The display device displays one pixel of a full-color image by displaying red in the subpixel 11 of the pixel cell 1, blue in the subpixel 12, and green in the subpixel 13.

  An example of an image displayed on the display device including the pixel cell 1 will be described with reference to FIGS. 2 and 3, an image of the character “NO” is displayed on the display device.

  FIG. 2 shows an image displayed on the display device when display control is performed in units of one pixel cell, and FIG. 3 shows a case where display control is performed in units of subpixels 11 to 13. An image displayed on the display device is shown.

  When display control is performed in units of subpixels 11 to 13, the combination of the three subpixels 11 to 13 for displaying one pixel can be changed. For example, since three subpixels 11 to 13 are arranged in the horizontal direction (horizontal direction) in the pixel cell 1, there are three combinations of three subpixels 11 to 13 for displaying one pixel in the horizontal direction. Exists. Therefore, when display control is performed in units of subpixels 11 to 13, the display device can handle three times the image data in the horizontal direction compared to when display control is performed in units of one pixel cell. The image to be displayed can be displayed. In other words, the display device can display an image having three times the horizontal definition.

  As a result, as shown in FIGS. 2 and 3, the image (FIG. 3) displayed when the display control is performed in units of subpixels 11 to 13 is controlled in the unit of pixel cell 1. The smoothness in the horizontal direction is improved as compared with the image displayed in FIG. The smoothness in the vertical direction (vertical direction) is the same.

  FIG. 4 is a diagram showing the shape of a pixel cell constituting a display device such as a conventional imaging device such as a CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor), a liquid crystal display, or a plasma display.

  In FIG. 4, the pixel cell 21 includes a rectangular sub-pixel 31-1, a sub-pixel 31-2, a sub-pixel 32, and a sub-pixel 33 having the same size. The subpixel 31-1 and the subpixel 31-2 display green, the subpixel 32 displays red, and the subpixel 33 displays blue. In the following, when it is not necessary to distinguish the subpixel 31-1 and the subpixel 31-2 from each other, they are collectively referred to as a subpixel 31.

  As shown in FIG. 4, the pixel cell 21 has a subpixel 31-1 at the upper left in the drawing, a subpixel 32 at the right side thereof, a subpixel 33 at the lower side of the subpixel 31-1, and a right side thereof. Subpixels 31-2 are arranged (below the subpixels 32), and this arrangement is called a checkered arrangement. In FIG. 4, each of the subpixels 31 to 33 has a horizontal (horizontal) length of 2 and a vertical (vertical) length of 1.5. These are all 3 (= 2 × 1.5), which is the same as the sub-pixels 11 to 13 in FIG.

  The display device displays one pixel of a full-color image by displaying green on the two subpixels 31-1 and 31-2 of the pixel cell 21, red on the subpixel 32, and blue on the subpixel 33. Is displayed.

  In FIG. 4, the two subpixels 31-1 and 31-2 each display green, but either the subpixel 31-1 or the subpixel 31-2 displays green. However, the other may display white.

  FIG. 5 is a diagram showing the shape of a pixel cell constituting a display device such as a conventional liquid crystal display or plasma display.

  In FIG. 5, the pixel cell 41 includes rectangular subpixels 51 to 53 having the same size. The subpixel 51 displays green, the subpixel 52 displays red, and the subpixel 53 displays blue. As shown in FIG. 5, the pixel cell 41 has a subpixel 51 at the upper left in the drawing, a subpixel 52 at the right side of the pixel cell 41, and a subpixel 51 and a center below the subpixel 52 (the left end of the subpixel 51. The subpixels 53 are arranged so that the left end of the subpixel 53 is arranged at a position on the right side by a half of the horizontal length of the subpixel 51). This arrangement is called a delta arrangement. In FIG. 5, each of the sub-pixels 51 to 53 has a horizontal (horizontal) length of 2 and a vertical (vertical) length of 1.5. The area of each of the sub-pixels 51 to 53 is These are all 3 (= 2 × 1.5) which is the same as the subpixels 11 to 13 in FIG. 1 and the subpixels 31 to 33 in FIG. 4.

  The display device displays one pixel of a full-color image by displaying green in the subpixel 51 of the pixel cell 41, red in the subpixel 52, and blue in the subpixel 53, respectively.

  Next, referring to FIG. 6 to FIG. 9, the display is composed of the pixel cell 1 of the RGB stripe arrangement of FIG. 1, the pixel cell 21 of the checkered arrangement of FIG. 4, and the pixel cell 41 of the delta arrangement of FIG. An image displayed on the apparatus will be described. 6 to 9, an image of the character “0” is displayed on the display device.

  In the display device including the pixel cells 1 having the RGB stripe arrangement of FIG. 1, when display control is performed in units of one pixel cell, an image of the character “0” displayed on the display device as shown in FIG. Becomes a straight (jagged) image.

  On the other hand, when display control is performed in units of subpixels 11 to 13 in the display device composed of the pixel cells 1 in the RGB stripe arrangement of FIG. 1, as described with reference to FIG. Compared to the case where display control is performed, it is possible to display an image having three times the horizontal definition. Therefore, as shown in FIG. 7, the image of the character “0” displayed on the display device is curvilinear (smooth) compared to the image of FIG. 6.

  In addition, in the display device including the checkered pixel cells 21 in FIG. 4, when display control is performed in units of subpixels 31 to 33, the pixel cells 21 include subpixels 31-1 and 32 ( Since the two sub-pixels of the sub-pixel 33 and the sub-pixel 31-2) are arranged in the horizontal direction, the display device is compared with the case where display control is performed in units of the sub-pixels 11 to 13 in FIG. An image with a horizontal resolution of 2/3 times is displayed. Therefore, as shown in FIG. 8, the image displayed when the display control is performed in units of subpixels 31 to 33 is an image in which the smoothness in the horizontal direction is deteriorated compared to the image of FIG. Yes.

  On the other hand, since two subpixels of a subpixel 31-1 and a subpixel 33 (subpixel 32 and subpixel 31-2) are arranged in the pixel cell 21 in the vertical direction, the display device includes: Compared with the case where display control is performed in units of one pixel cell or subpixels 11 to 13 in FIG. 1, an image corresponding to twice the image data in the vertical direction can be displayed. In other words, the display device can display an image having twice the vertical definition as compared with the cases of FIGS.

  Therefore, as shown in FIG. 8, when display control is performed in units of subpixels 31 to 33, the image displayed on the display device has a smoothness in the vertical direction compared to the images of FIGS. It is an improved image.

  Further, the display device including the pixel cell 41 of FIG. 5 displays one pixel of a full-color image by displaying each color on the three sub-pixels 51 to 53 having an area of 3, so that the area of 3 is displayed. In order to display one pixel of a full-color image by displaying each color on the four sub-pixels 31 to 33 as compared with the display device including the pixel cell 21 of FIG. 4 that displays one pixel of a full-color image. The area required for this is reduced.

  As a result, when display control is performed in units of subpixels 51 to 53 in the display device including the pixel cells 41 having the delta arrangement shown in FIG. 5, the image displayed on the display device is as shown in FIG. The image is smoother than the image of FIG.

  As described above, in the display device, the smoothness of the displayed image is obtained even in the same area by the shape and arrangement of the subpixels 11 to 13, 31 to 33, or 41 to 44 constituting the display device. Is different.

Each pixel cell unit is composed of a regular hexagonal pixel cell composed of two sub-pixels displaying a red color, two sub-pixels displaying a blue color, and two sub-pixels displaying a green color. Has proposed an image output apparatus for controlling image output (display) (see, for example, Patent Document 1). In this image output device, since the shape of the pixel cell is a regular hexagonal shape, it is possible to display an image of a line having an angle of ± 30 degrees with respect to the horizontal line. Realizes image display.
JP 2000-121990 A

  However, in the pixel cell of Patent Document 1 described above, since display control is performed on a pixel cell basis, it is difficult to display an image smoothly.

  The present invention has been made in view of such a situation, and makes it possible to display a smooth image.

The display device of the present invention includes a display unit in which a plurality of rhombus-shaped display elements are arranged adjacent to each other in different directions, and display control for independently driving each display element and displaying an image on the display unit And the display control means includes a unit of a hexagonal first display element group constituted by three adjacent display elements and a unit of a second display element group constituted by four adjacent display elements. Then, the display element is driven to display an image on the display means .

The shape of the second display element group may be a ladder shape.

Display control means, by displaying different colors for the display elements of the first display element group, it is possible to display an image on the display unit.

  The plurality of first display element groups, the plurality of second display element groups, or the first display element group and the second display element group can include at least one identical display element.

The display device further includes image generation means for generating higher resolution image data based on the input image data, and the display control means converts the high resolution image data generated by the image generation means. Based on this, an image can be displayed on the display means.

The display element can be constituted by a small display element which is a display element having two triangular shapes.
In this case, the shape of the second display element group can be a ladder shape.
The display control means can display an image on the display means by displaying a different color on each small display element of the first display element group.
The plurality of first display element groups, the plurality of second display element groups, or the first display element group and the second display element group can include at least one same small display element. .
The display device further includes image generation means for generating higher resolution image data based on the input image data, and the display control means converts the high resolution image data generated by the image generation means. Based on this, an image can be displayed on the display means.
Display control method of the present invention, viewed including a display control step of displaying an image by driving each display element independently, in the display control step, the first display of the hexagon consists of three display elements adjacent The display element is driven by the element group unit and the second display element group unit composed of four adjacent display elements, and an image is displayed on the display device .

In the display device and the display control method of the present invention, each display element of the display means (display device) in which a plurality of rhombus-shaped display elements are arranged so as to be adjacent to each other in different directions is displayed as three adjacent displays. The display unit ( display device) displays images on the display unit ( display device) by independently driving in units of a hexagonal first display element group composed of elements and a unit of a second display element group composed of four adjacent display elements. Display.

  According to the present invention, a smooth image can be displayed.

  Embodiments of the present invention will be described below. Correspondences between constituent elements described in the claims and specific examples in the embodiments of the present invention are exemplified as follows. This description is to confirm that specific examples supporting the invention described in the claims are described in the embodiments of the invention. Therefore, even if there are specific examples that are described in the embodiment of the invention but are not described here as corresponding to the configuration requirements, the specific examples are not included in the configuration. It does not mean that it does not correspond to a requirement. On the contrary, even if a specific example is described here as corresponding to a configuration requirement, this means that the specific example does not correspond to a configuration requirement other than the configuration requirement. not.

  Further, this description does not mean that all the inventions corresponding to the specific examples described in the embodiments of the invention are described in the claims. In other words, this description is an invention corresponding to the specific example described in the embodiment of the invention, and the existence of an invention not described in the claims of this application, that is, in the future, a divisional application will be made. Nor does it deny the existence of an invention added by amendment.

The display device according to claim 1 (for example, the display device 101 in FIG. 10)
A plurality of rhombus-shaped display elements (for example, the subpixels 261 to 263 in FIG. 15) are arranged so as to be adjacent to each other in different directions (for example, the display unit 123 in FIG. 10);
Display control means for driving each display element independently and displaying an image on the display means (for example, the display control unit 122 in FIG. 10) ,
The display control means is composed of a unit of a hexagonal first display element group (for example, the subpixel group 271 in FIG. 16) composed of three adjacent display elements and four adjacent display elements. The display element is driven in units of a second display element group (for example, the sub-pixel group 272 in FIG. 16), and the image is displayed on the display means .

The display device according to claim 3 is:
Wherein the display control unit, the first display element group of different colors to each display element (e.g., red, green, blue) by displaying, characterized in that for displaying the image on the display means.

The display device according to claim 4 comprises:
A plurality of first display element groups (for example, subpixel group 271 ₁ in FIG. 17 and subpixel group 271 _{3 in} FIG. 21), a plurality of second display element groups (for example, subpixel group 272 in FIG. 18). ₁ and the sub-pixel group 272 ₂ ) of FIG. 19, or the first display element group (for example, the sub-pixel group 271 ₄ of FIG. 22) and the second display element group (for example, the sub-pixel group 272 of FIG. 18). ₁ ) includes at least one identical display element (for example, subpixel 263 ₅ in FIG. 17, subpixel 261 _{7 in} FIG. 18).

The display device according to claim 5 is:
Image generation means for generating higher resolution image data based on the input image data (for example, the high-density image generation unit 121 in FIG. 10).
Further comprising
The display control means causes the display means to display the image based on high resolution image data generated by the image generation means.

The display control method according to claim 11 comprises:
In a display control method for a display device (for example, the display device 101 in FIG. 10) including a plurality of rhombus-shaped display elements (for example, the subpixels 261 to 263 in FIG. 15) arranged so as to be adjacent to each other in different directions. ,
A display control step (for example, step S3 in FIG. 30) in which each display element is driven independently to display an image.
Only including,
In the display control step, the unit of the hexagonal first display element group constituted by the three adjacent display elements and the unit of the second display element group constituted by the four adjacent display elements are described above. A display element is driven to display the image on the display device .

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

  FIG. 10 is a block diagram showing a configuration example of the first embodiment of the display device to which the present invention is applied.

  A tuner 111, a video player 112, and a PC (personal computer) 113 are connected to the display device 101 of FIG.

  The tuner 111 receives radio waves from the ground wave or satellite, acquires an image signal of a broadcast program, and inputs image data that is digital data corresponding to the acquired image signal to the display device 101.

  The video player 112 reproduces image data recorded on a recording medium such as a video tape, and inputs the reproduced image data to the display device 101.

  The PC 113 reproduces image data recorded on a recording medium such as a removable medium or image data recorded on a built-in hard disk, and inputs the reproduced image data to the display device 101.

  The display device 101 includes a high-density image generation unit 121, a display control unit 122, and a display unit 123. Based on the image data input from the tuner 111, the video player 112, or the PC 113, the display device 101 has high-density image data. And a high density image is displayed based on the image data of the generated high density image.

  Here, the high-density image refers to an image having a resolution N (N is an arbitrary number) times that of an image displayed based on image data input from the tuner 111, the video player 112, or the PC 113. In other words, the high-density image is an image obtained by making an image displayed based on the input image data N times dense in the spatial direction.

  The high density image generation unit 121 generates image data of a high density image based on the image data input from the tuner 111, the video player 112, or the PC 113. The high density image generation unit 121 supplies the image data of the generated high density image to the display control unit 122.

  The display control unit 122 drives a plurality of sub-pixels (display elements) constituting the display unit 123 described later based on the image data of the high-density image supplied from the high-density image generation unit 121 to display the high-density image. Display. The display unit 123 includes a plurality of pixel cells including three diamond-shaped subpixels that are independently driven. The display control unit 122 drives the subpixels of the display unit 123 to display red, green, or blue on the subpixels. As a result, a high density image is displayed on the display unit 123.

  FIG. 11 is a block diagram illustrating a detailed configuration example of the high-density image generation unit 121 in FIG.

  Here, the image data input from the tuner 11, the video player 12, or the PC 13 in FIG. 10 is used as image data of a standard definition image (SD (Standard Definition) image), and the high-density image generation unit 121. The generated high-density image data is image data of a high definition image (HD (High Definition) image).

  The high density image generation unit 121 includes a mapping processing unit 131 and a tap coefficient memory 132. The mapping processing unit 131 generates HD image image data based on the tap coefficient stored in the tap coefficient memory 132 and the input image data of the SD image. The mapping processing unit 131 supplies the image data of the HD image to the display control unit 122.

  The mapping processing unit 131 includes a class classification unit 141, a prediction tap acquisition unit 144, and a prediction calculation unit 145.

  The class classification unit 141 includes a class tap acquisition unit 142 and a waveform classification unit 143, and sequentially sets pixels constituting the HD image as a target pixel, and image data of the SD image input from the tuner 111, the video player 112, or the PC 13 In accordance with the above, the target pixel is classified.

  The class tap acquisition unit 142 performs SD classification for classifying the pixel of interest into one of several classes from image data that is the pixel value of each pixel of the input SD image. Some pixel values of the pixels constituting the image are acquired as class taps and supplied to the waveform classification unit 143.

  The waveform classification unit 143 performs class classification to classify the pixel of interest into one of a plurality of classes based on the pixel values of the pixels constituting the class tap from the class classification unit 142, and the class obtained as a result Is generated and supplied to the prediction tap acquisition unit 144. For example, the waveform classification unit 143 classifies the target pixel into one of 512 classes, and supplies the class number corresponding to the classified class to the prediction tap acquisition unit 144.

  Here, as a method of classifying, for example, ADRC (Adaptive Dynamic Range Coding) or the like can be employed.

  In the method using ADRC, pixel values of pixels constituting the class tap are subjected to ADRC processing, and the class of the pixel of interest is determined according to the ADRC code obtained as a result.

In the K-bit ADRC, for example, the maximum value MAX and the minimum value MIN of the pixels constituting the class tap are detected, and DR = MAX-MIN is set as the local dynamic range of the set, and this dynamic range Based on DR, the pixel values constituting the class tap are requantized to K bits. That is, the pixel value of each pixel forming the class taps, the minimum value MIN is subtracted, and the subtracted value is divided (quantized) by DR / 2 ^K. A bit string obtained by arranging the pixel values of the K-bit pixels constituting the class tap in a predetermined order is output as an ADRC code. Therefore, for example, when the class tap is subjected to 1-bit ADRC processing, the pixel value of each pixel constituting the class tap is divided by the average value of the maximum value MAX and the minimum value MIN (rounded down). Thereby, the pixel value of each pixel is set to 1 bit (binarized). Then, a bit string in which the 1-bit pixel values are arranged in a predetermined order is output as an ADRC code. For example, the waveform classification unit 143 outputs an ADRC code obtained by performing ADRC processing on a class tap as a class number.

Note that the waveform classification unit 143 can output, for example, a level distribution pattern of pixel values of pixels constituting a class tap as a class number as it is. However, in this case, if the class tap is composed of pixel values of N pixels and K bits are assigned to the pixel values of each pixel, the number of class numbers output by the waveform classification unit 143 is (2 ^N ) There are ^K ways, which is a huge number that is exponentially proportional to the number of bits K of the pixel value of the pixel.

  Therefore, the waveform classification unit 143 preferably performs class classification by compressing the information amount of the class tap by the above-mentioned ADRC processing or vector quantization.

  The prediction tap acquisition unit 144 acquires, as prediction taps, some of the pixel values of the pixels constituting the SD image used for predicting the pixel value of the target pixel from the input image data of the SD image. The prediction tap acquisition unit 144 supplies the acquired prediction tap and the class number from the waveform classification unit 182 to the prediction calculation unit 145.

  Based on the class number from the prediction tap acquisition unit 144, the prediction calculation unit 145 reads the tap coefficient corresponding to the class of the class number from the tap coefficient memory 132. The prediction calculation unit 145 uses the tap coefficient and the prediction tap from the prediction tap acquisition unit 144 to perform a predetermined prediction calculation for obtaining a true prediction value of the pixel value of the target pixel. Thereby, the prediction calculation unit 145 calculates the pixel value of the pixel of interest (predicted value thereof), that is, the pixel value of the pixels constituting the HD image, and outputs it as image data of the HD image.

  The tap coefficient memory 132 stores a tap coefficient for each class obtained by a calculation unit described later.

  Next, the tap structure of the class tap and the prediction tap will be described with reference to FIGS. 12A and 12B.

  12A and 12B show examples of tap structures of prediction taps and class taps.

  FIG. 12A shows an example of a tap structure of a class tap. In the example of FIG. 12A, a class tap is configured by nine pixels P1 to P9. That is, in the example of FIG. 12A, the pixel value of the pixel P5 corresponding to the target pixel in the image data of the SD image input from the tuner 111, the video player 112, or the PC 113, and the upward direction (P1, A so-called cross-shaped class tap is constituted by pixel values of two pixels adjacent to each other in the P2), the downward direction (P8, P9), the left direction (P3, P4), and the right direction (P6, P7).

  FIG. 12B shows an example of the tap structure of the prediction tap. In the example of FIG. 12B, a prediction tap is configured with pixel values of 13 pixels. That is, in the example of FIG. 12B, the pixel value of five pixels arranged in the vertical direction around the pixel corresponding to the target pixel in the image data of the SD image input from the tuner 111, the video player 112, or the PC 113, The pixel values of three pixels arranged in the vertical direction centering on the pixels adjacent to the left and right of the pixel corresponding to the pixel, and the pixel values of the pixels located one pixel on the left and right from the pixel corresponding to the target pixel Therefore, a so-called diamond-shaped class tap is formed.

  Next, the prediction calculation in the prediction calculation unit 145 of FIG. 11 and the learning of tap coefficients used for the prediction calculation will be described.

  Assuming that, for example, a linear primary prediction calculation is adopted as the predetermined prediction calculation, a pixel value y of an HD image pixel (hereinafter referred to as an HD pixel as appropriate) is obtained by the following linear linear expression. It will be.

・・・（１）

... (1)

However, in Expression (1), x _n represents the pixel value of the pixel of the nth SD image (hereinafter referred to as SD pixel as appropriate) that constitutes the prediction tap for the HD pixel (pixel value y thereof), w _n represents the n th tap coefficient multiplied by the n th SD pixel (pixel value thereof). In equation (1), the prediction tap is assumed to be composed of N SD pixels x ₁ , x ₂ ,..., X _N.

  Here, the pixel value y of the HD pixel can be obtained not by the linear primary expression shown in Expression (1) but by a higher-order expression of the second or higher order.

Now, when the true value of the pixel value of the HD pixel of the k-th sample is expressed as y _k and the predicted value of the true value y _k obtained by the equation (1) is expressed as y _k ′, the prediction error _ek is Is expressed by the following equation.

・・・（２）

... (2)

Now, since the predicted value y _k ′ of Equation (2) is obtained according to Equation (1), the following equation is obtained by replacing y _k ′ of Equation (2) according to Equation (1).

・・・（３）

... (3)

In Equation (3), x _{n, k} represents the pixel value of the nth SD pixel constituting the prediction tap for the HD pixel of the kth sample.

Tap coefficient w _n for the prediction error e _k 0 of the formula (3) (or Equation (2)) is, is the optimal for predicting the pixel value of the HD pixel, for all the HD pixels, the It is generally difficult to obtain such a tap coefficient w _n .

Therefore, as the standard for indicating that the tap coefficient w _n is optimal, for example, when adopting the method of least squares, optimal tap coefficient w _n, the sum E of square errors expressed by the following formula It can be obtained by minimizing.

・・・（４）

... (4)

However, in Equation (4), K is the pixel value y _k of the HD pixel and the pixel value x _{1, k} , x _{2 of} the SD pixel that constitutes the prediction tap for the HD pixel (pixel value y _k ) _{. This} represents the number of samples (the number of learning samples) of _{k 1} ,..., x _{N, k} .

The minimum value of the sum E of square errors of Equation (4) (minimum value), as shown in Equation (5), given that by partially differentiating the sum E with the tap coefficient w _n by w _n to 0.

・・・（５）

... (5)

Therefore, when partial differentiation of above equation (3) with the tap coefficient w _n, the following equation is obtained.

・・・（６）

... (6)

  From the equations (5) and (6), the following equation is obtained.

・・・（７）

... (7)

By substituting equation (3) into e _k in equation (7), equation (7) can be expressed by the normal equation shown in equation (8).

・・・（８）

... (8)

Normal equation of Equation (8), for example, by using a like sweeping-out method (Gauss-Jordan elimination method) can be solved for the tap coefficient w _n.

By solving the normal equations in equation (8) for each class, the optimal tap coefficient (here, the tap coefficient that minimizes the sum E of square errors) to w _n, can be found for each class.

Figure 13 shows a configuration example of a calculation unit 150 which performs learning for calculating a tap coefficient w _n for each class by solving the normal equations in equation (8).

The calculation unit 150, image data of HD image for learning used for learning of the tap coefficient w _n is input.

  The HD image frame memory 151 stores image data of the input HD image. The HD image frame memory 151 supplies the stored image data of the HD image to the weighted average unit 152 and the learning unit 154.

  The weighted average unit 152 uses the pixel value of each pixel of the HD image supplied from the HD image frame memory 151 as the unit of N pixels adjacent to the pixel value of the N pixels adjacent to each other. And the resulting value is divided by N. That is, the weighted average unit 152 performs a weighted average of 1 / N on the image data of the HD image. Then, the weighted average unit 152 supplies the image data obtained as a result of the weighted average of 1 / N to the SD image frame memory 153 as image data of the SD image corresponding to the input HD image image data.

  The SD image frame memory 153 stores the image data of the SD image supplied from the weighted average unit 152. The SD image frame memory 153 supplies the stored image data of the SD image to the learning unit 154.

The learning unit 154 determines the tap coefficient w _n based on the image data of the HD image supplied from the HD image frame memory 151 and the image data of the SD image corresponding to the HD image supplied from the SD image frame memory 153. The tap coefficient w _n is generated and supplied to the tap coefficient memory 155. Tap coefficient memory 155 stores a tap coefficient w _n supplied from the learning unit 154.

  FIG. 14 is a block diagram illustrating a detailed configuration example of the learning unit 154 in FIG. 13.

  The learning unit 154 includes a class classification unit 161, a prediction tap acquisition unit 162, a target pixel acquisition unit 163, a normal equation generation unit 164, and a coefficient calculation unit 165.

  The class tap classification unit 161 includes a class tap acquisition unit 181 and a waveform classification unit 182. The class tap acquisition unit 181 sequentially sets pixels constituting the HD image as pixels of interest, and the pixel values of the pixels constituting the SD image that is image data of the SD image supplied from the SD image frame memory 153 with respect to the pixels of interest. By extracting predetermined ones, class taps having the same tap structure as the class tap acquisition unit 142 shown in FIG. 11 are configured and supplied to the waveform classification unit 182.

  The waveform classification unit 182 performs the same class classification as the waveform classification unit 143 of FIG. 11 based on the class tap from the class tap acquisition unit 181, and assigns the class number corresponding to the resulting class to the prediction tap acquisition unit 162. To supply.

  The prediction tap acquisition unit 162 extracts a predetermined pixel value of each pixel of the SD image that is image data of the SD image supplied from the SD image frame memory 153 with respect to the target pixel, so that the prediction of FIG. A prediction tap having the same tap structure as that of the tap acquisition unit 144 is configured and supplied to the target pixel acquisition unit 163. In addition, the prediction tap acquisition unit 162 supplies the class number from the waveform classification unit 182 to the target pixel acquisition unit 163.

  The target pixel acquisition unit 163 extracts the pixel value of the target pixel from the image data of the HD image supplied from the HD image frame memory 151. The target pixel acquisition unit 163 supplies the pixel value of the target pixel and the prediction tap and class number supplied from the prediction tap acquisition unit 162 to the normal equation generation unit 164.

  The normal equation generation unit 164 performs addition for each pixel number of the target pixel acquisition unit 163 for the pixel value of the target pixel from the target pixel acquisition unit 163 and the prediction tap.

That is, the normal equation generation unit 164 is supplied with the image data y _k , the prediction tap x _{n, k} , and the class number of the HD image stored in the HD image frame memory 151.

Then, the normal equation generation unit 164 uses the prediction tap x _{n, k} for each class corresponding to the class number supplied from the pixel-of-interest acquisition unit 163, and the image data of the SD image in the matrix on the left side of Expression (8) An operation corresponding to multiplication (x _{n, k} x _{n ′, k} ) and summation (Σ) is performed.

Furthermore, the normal equation generation unit 164 again uses the prediction tap x _{n, k} and the HD image image data y _k for each class corresponding to the class number supplied from the target pixel acquisition unit 163, and the equation (8). The calculation corresponding to the multiplication (x _{n, k} y _k ) of the prediction tap x _{n, k} and the image data y _k of the HD image and the summation (Σ) in the vector on the right side of.

That is, the normal equation generation unit 164 lastly calculates the left-side matrix component (Σx _{n, k} x _{n ′, k} ) in Expression (8) obtained for the image data of the HD image of the pixel that is the target pixel last time, The vector component (Σx _{n, k} y _k ) on the right side is stored in its built-in memory (not shown), and the matrix component (Σx _{n, k} x _{n ′, k} ) or vector component ( Σx _{n, k} y _k ), HD image data y _{k + 1 of the} HD image and image data x _{n, k + 1} of the SD image are _obtained for the image data of the HD image of the pixel newly selected as the target pixel. Add the corresponding component x _{n, k + 1} x _{n ′, k + 1} or x _{n, k + 1} y _{k + 1} calculated using (addition represented by the summation in equation (8)) Do).

  Then, when the normal equation shown in Expression (8) is established for each class by performing the above addition using all the pixels constituting the HD image as the target pixel, the normal equation generation unit 164 generates the normal equation. The equations are supplied to the coefficient calculator 165.

The coefficient calculation unit 165 finds and outputs the optimum tap coefficient w _n for each class by solving the normal equation for each class supplied from the normal equation generation unit 164.

The tap coefficient memory 132 of FIG. 11, for example, the tap coefficient w _n for each class determined as described above is stored.

  Next, FIG. 15 shows an example of a pixel cell constituting the display unit 123 of FIG. In the figure, R, G, and B represent red, green, and blue, respectively.

  As shown in FIG. 15, the pixel cell 251 has the same size rhombus (the lengths of the four sides are the same, the opposite sides are parallel, one opposite two angles are 60 degrees, and the other Are formed from sub-pixels 261 to 263 having a quadrangular shape of 120 degrees. The subpixel 261 displays green, the subpixel 262 displays blue, and the subpixel 263 displays red. The pixel cell 251 has different subpixels 261 to 263 (the subpixel 261 has a longer axis (hereinafter referred to as a major axis) of the distances between vertices, and the subpixel 262 has a major axis of 30. The subpixels 263 are arranged so that their major axes are 30 degrees to the right and the three major axes form an equilateral triangle, and the pixel cells 251 are arranged in a regular hexagonal shape. It has a shape. This arrangement of the subpixels 261 to 263 of the pixel cell 251 is called a hexa arrangement.

  In FIG. 15, the length of one side of the rhombus of each of the subpixels 261 to 263 is 1.862, the distance (length) between the parallel sides is 1.612, and the area (size) of each of the subpixels 261 to 263 is shown. Is about 3 (= 1.862 × 1.612).

  The display unit 123 of FIG. 10 includes a plurality of pixel cells 251, and the display control unit 122 performs subpixels 261 to 263 of the display unit 123 based on the image data of the high-density image from the high-density image generation unit 121. Are driven independently, and the subpixel 261 displays green, the subpixel 262 displays blue, and the subpixel 263 displays red, thereby displaying a full-color high-density image on the display unit 123.

Hereinafter, when a plurality of pixel cells 251 are distinguished, each pixel cell 251 is referred to as a pixel cell 251 _m (m is an arbitrary number). In addition, the subpixels 261 to 263 forming the pixel cell 251 _m are referred to as subpixels 261 _{m to} 263 _m .

  A first driving method in which the display control unit 122 drives the sub-pixels 261 to 263 constituting the display unit 123 will be described with reference to FIGS.

As shown in FIG. 16, in the first driving method, a sub-pixel group in which three adjacent sub-pixels are combined in a regular hexagon shape, or two adjacent sub-pixels are linearly symmetrical (butterfly shape). ), One pixel as an image unit is displayed in one of the sub-pixel groups composed of four sub-pixels. For example, the display control unit 122 drives the subpixels 261 _{1 to} 263 ₁ constituting the pixel cell 251 ₁ independently to display one pixel as a unit of a high-density image. Hereinafter, a group of regular hexagonal subpixels 261 to 263 displaying one pixel is referred to as a subpixel group 271. For example, in FIG. 16, the sub-pixel group 271 includes sub-pixels 261 _{1 to} 263 ₁ .

The display control unit 122, for example, sub-pixel 262 ₂ and the sub-pixels 263 _{and second} pixel cells 251 _2, pixel cells 251 ₃ subpixels 261 ₃ adjacent to the upper right of the pixel cell 251 _2, and the pixel cells 251 ₂ The subpixels 261 ₄ of the pixel cell 251 ₄ adjacent to the lower right (below the pixel cell 251 ₃ ) are driven to display one pixel of the high-density image.

In the following description, there are two sub-pixels adjacent to each other in the upper right direction, and two sub-pixels adjacent to each other in the lower right direction in line symmetry with respect to them. A collection of sub-pixels having a shape (butterfly shape) is referred to as a sub-pixel group 272. For example, in FIG. 16, the subpixel group 272 includes subpixels 262 ₂ and 261 ₃ that are adjacent to each other in the upper right direction, and subpixels 263 that are adjacent to each other in the lower right direction. ₂ and subpixel 261 ₄ .

When the sub-pixel group 271 and the sub-pixel group 272 display pixels having the same value, the green luminance displayed on the sub-pixel 261 ₃ and the sub-pixel 261 ₄ is the green luminance displayed on the sub-pixel 261 ₁ , respectively. Half of the brightness. That is, the sum of the green luminances displayed on the subpixel 261 ₃ and the subpixel 261 ₄ is equal to the green luminance displayed on the subpixel 261 ₁ .

Hereinafter, when a plurality of subpixel groups 271 need to be individually distinguished, each subpixel group 271 is referred to as a subpixel group 271 _m, and a plurality of subpixel groups 272 need to be individually distinguished. Each subpixel group 272 is referred to as a subpixel group 272 _m .

  As shown in FIG. 16, in the first driving method, the display control unit 122 sequentially displays pixels in any of eight patterns including a regular hexagonal subpixel group 271 and a ladder-shaped subpixel group 272. As a result, a high-density image is displayed on the display unit 123.

Specifically, in the first driving method, for example, first, as shown in FIG. 17, the display control unit 122 drives the sub-pixel 261 ₅ to 263 ₅ of the pixel cell 251 _5, respectively, the subpixels 261 to ₅ or a regular hexagon sub-pixel groups 271 ₁ consisting of 263 ₅ to display one pixel of the high density image.

Next, the display control unit 123, as shown in FIG. 18, the sub-pixels 262 ₅ and the sub-pixels 263 ₅ of the pixel cells 251 _5, sub-pixel 261 ₆ pixel cells 251 ₆ adjacent to the upper right of the pixel cells 251 _5, In addition, the subpixel 261 ₇ of the pixel cell 251 ₇ adjacent to the lower right of the pixel cell 251 ₅ (below the pixel cell 251 ₆ ) is driven, and the subpixels 262 ₅ , 263 ₅ , 261 ₆ , and subpixel 261 ₇ are driven. the sub-pixel groups 272 ₁ of tofu-type made to display one pixel of the high density image.

Further, the display control unit 123, as shown in FIG. 19, the sub-pixels 261 ₆ and the sub-pixels 263 ₆ pixel cells 251 _6, and the respective sub-pixels of the sub-pixels 261 ₇ and the sub-pixels 262 ₇ pixel cells 251 ₇ each driven to display a tofu-shaped sub-pixel group 272 ₂ in 1 pixel consisting. The shape of the subpixel group 272 _{2 in} FIG. 19 is a shape obtained by horizontally inverting the subpixel group 272 ₁ in FIG.

Next, the display control unit 122, as shown in FIG. 20, the sub-pixels 263 ₆ pixel cells 251 _6, sub-pixels 262 ₇ pixel cell 251 _7, and the pixel cells 251 ₆ bottom right (pixel cells 251 ₇ Each subpixel of the subpixel 261 ₈ of the pixel cell 251 ₈ adjacent to the upper right) is driven, and one pixel of the high-density image is displayed on the regular hexagonal subpixel group 271 ₂ composed of them.

  In the first driving method, the display control unit 122 repeatedly drives the sub-pixels 261 to 263 as described above, thereby causing the display unit 123 to have a predetermined high-density image in the horizontal direction (the horizontal direction in the figure). The pixels of the horizontal line # 1 (the first horizontal line from the top) are displayed.

  The display control unit 122 displays the horizontal line # l + 1 after displaying the horizontal line #l of the high-density image.

Specifically, the display control unit 122, as shown in FIG. 21, the pixel cell 251 subpixels 263 _{5 5,} under the sub-pixel 261 _7, and pixel cells 251 ₅ of the pixel cell 251 ₇ (pixel cell 251 ₇ Each subpixel of the subpixel 262 ₉ of the pixel cell 251 ₉ adjacent to the lower left of the pixel cell 251 ₉ is driven, and one pixel of the high-density image is displayed on the regular hexagonal subpixel group 271 ₃ made of them.

Next, as shown in FIG. 22, the display control unit 122 drives each subpixel of the regular hexagonal subpixel group 271 _{4 including} the subpixels 261 _{7 to} 263 ₇ of the pixel cell 251 _7. One pixel of the high-density image is displayed on 271 ₄ .

Further, the display control unit 122, as shown in FIG. 23, lower right (pixel subpixel 261 _8, and pixel cells 251 ₇ subpixels 262 ₇ and the sub-pixels 263 ₇ pixel cell 251 _7, pixel cell 251 ₈ Each subpixel of the subpixel 261 ₁₀ of the pixel cell 251 ₁₀ adjacent to the cell 251 ₈ (below the cell 251 ₈ ) is driven, and one pixel of the high-density image is displayed on the ladder-shaped subpixel group 272 ₃ made of them.

Next, the display control unit 122, as shown in FIG. 24, tofu type consisting of sub-pixels 261 ₁₀ and the sub-pixel 262 ₁₀ subpixels 261 ₈ and the sub-pixels 263 _8, and the pixel cell 251 ₁₀ of the pixel cell 251 ₈ Each subpixel of the subpixel group 272 ₄ is driven, and one pixel of the high-density image is displayed on the subpixel group 272 ₄ .

  By repeatedly driving the sub-pixels 271 to 273 as described above, the pixels of the horizontal line # l + 1 of the high-density image are displayed on the display unit 123.

  Thus, in this embodiment, each pixel is displayed by the sub-pixel groups 271 and 272 having different shapes, so that the display position of each pixel is recognized as the center of gravity of each sub-pixel group.

  Therefore, the centroids of the subpixel group 271 and the subpixel group 272 will be described with reference to FIGS.

  As shown in FIG. 25, the center of gravity of the subpixel group 271 is a center A of a regular hexagon.

The center of gravity of the subpixel group 272 will be described with reference to FIGS. 26 to 28, the center of gravity of the subpixel group 272 ₂ (FIG. 19) will be described.

As shown in FIG. 26, for example, the centroids of the diamond-shaped subpixels 261 ₆ , 263 ₆ , 262 ₇ , and 261 ₇ that constitute the subpixel group 272 ₂ are the points B to E at the center, respectively.

Accordingly, as shown in FIG. 27, if the midpoint of the straight line BC connecting the points B and C is the point F and the midpoint of the straight line DE connecting the points D and E is the point G, as shown in FIG. The center of gravity H of the sub-pixel group 272 ₂ is the midpoint of the straight line FG connecting the points F and G. The centroid H from the left end of the lower side of the sub-pixels 263 _6, located to the length of 3/8 of one side of the rhombus.

  As described above, the centroid A of the subpixel group 271 and the centroid H of the subpixel group 272 are at different positions.

As described with reference to FIGS. 17 to 24 described above, in the first driving method, the display control unit 122 drives the subpixels 261 to 263 constituting the subpixel group 271 or the subpixel group 272, respectively. One pixel of the high-density image is displayed on the pixel group 271 or the sub-pixel group 272. Therefore, for example, in the pixel cell 251 ₇ , as shown in FIG. 29, the centroid A 1 of the sub-pixel group 271 _{4 and} the centroid A ₂ of the sub-pixel group 271 ₂ , and the centroid H 1 of the sub-pixel group 272 ₂ and the sub-pixel group 272. ₃ centroids H2 are included. That is, the pixel cell 251 includes two centroids A and centroids H of the subpixel group 271 and the subpixel group 272 (the pixels of the high-density image displayed by the subpixel group 271).

  In contrast, for example, in a display device in which display is controlled in units of conventional pixel cells (for example, pixel cell 1 in FIG. 1), one pixel of an image is displayed by one pixel cell. That is, the center of gravity of the pixels of the image included in the pixel cell is one.

  Since there is only one pixel centroid for one pixel of the image, it can be said that the number of centroids included in the pixel cell 251 represents the number of pixels displayed in the pixel cell 251. As shown in FIG. 29, the pixel cell 251 includes the four centroids of the centroid A1 and the centroid A2 and the centroid H1 and the centroid H2 at different positions in the horizontal direction (left-right direction in the figure). Two different centroids, the centroid H1 (A1) and the centroid H2 (A2), are included at different positions in the middle and vertical directions.

  For example, the size of the conventional pixel cell 1 is 3, which is the same as the size of the pixel cell 251. Accordingly, the high-density image displayed on the display unit 123 including the pixel cells 251 has a horizontal definition (horizontal definition) as compared with a conventional display device whose display is controlled in units of one pixel cell. The image is four times as high as the vertical definition (vertical definition).

  In other words, the display unit 123 can display a high-density image having a horizontal resolution of 4 times dense and a vertical resolution of 2 times dense. In this case, in the high-density image generation unit 121, based on an image (SD image) that is input from the tuner 111, the video player 112, or the PC 113, for example, when display is controlled in units of one pixel cell, A high-density image (HD image) in which the resolution in the horizontal direction is four times dense and the resolution in the vertical direction is twice dense is generated.

  As described above, when the display control unit 122 performs driving by the first driving method, the display device 101 performs display on the display unit 123 as compared with a display device in which display is controlled in units of one pixel cell. The resolution of the image can be improved. In addition, a display device in which display is controlled in units of subpixels 11 to 13 (FIG. 1) capable of displaying an image having a horizontal resolution three times that of a conventional display device in which display is controlled in units of one pixel cell. Or, compared with a display device in which display is controlled in units of subpixels 31 to 33 (FIG. 4) or subpixels 51 to 53 (FIG. 5) capable of displaying an image having double vertical and horizontal definition. The resolution of the image displayed on the display unit 123 can be improved. As a result, the display device 101 can improve the smoothness of the displayed image.

  The subpixels 261 to 263 constituting the pixel cell 251 have the same size as the conventional subpixels 11 to 13 (FIG. 1), subpixels 31 to 33 (FIG. 4), or subpixels 51 to 53 (FIG. 5). Is the size of

  Therefore, the display device 101 including the display unit 123 including the pixel cell 251 in FIG. 15 can improve the smoothness of an image to be displayed without using a semiconductor miniaturization technique. That is, the display device 101 can display a smoother image without investing a very high development fund necessary for miniaturization of a semiconductor and an expensive equipment investment.

  Further, since the size of the pixel cell 251 is the same as that of the conventional pixel cell 1 (21, 41), the number of pixel cells 251 constituting the display unit 123 does not increase. Therefore, the defect rate of the display unit 123 generated in the manufacturing stage is not deteriorated due to the characteristics of the pixel cell 251. Furthermore, the drive frequency of the subpixels 261 to 263 does not increase due to the increase in the number of pixel cells 251 and the power consumption does not increase. In other words, the display device 101 can display a smoother image without causing a deterioration of the defect rate of the display unit 123 and an increase in power consumption.

  Next, a display process in which the display device 101 in FIG. 10 displays a high-density image on the display unit 123 will be described with reference to FIG. This display process is started when image data is input from, for example, the tuner 111, the video player 112, or the PC 113.

  In step S <b> 1, the high-density image generation unit 121 acquires input image data from the tuner 111, the video player 112, or the PC 113.

  Next, in step S2, the high-density image generation unit 121 generates high-density image data from the image data acquired in step S1, as described above with reference to FIGS. Specifically, for example, when the high-density image generation unit 121 acquires an SD image suitable for display control in units of one pixel cell, the horizontal resolution is based on the image data of the SD image. Is generated four times densely and image data of a high-density image in which the vertical resolution is doubled. Then, the high-density image generation unit 121 supplies the generated high-density image image data to the display control unit 122.

  When the high-density image generation unit 121 acquires a high-density image suitable for display on the display unit 123 from the tuner 111, the video player 112, or the PC 113, the process of step S2 is skipped. In this case, the display device 101 may not be provided with the high-density image generation unit 121.

  After the process of step S2, the process proceeds to step S3, and the display control unit 122 drives the subpixel based on the image data of the high density image supplied from the high density image generation unit 121. Specifically, the subpixels 261 to 263 are driven in units of the subpixel group 271 or the subpixel group 272, and a high-density image is displayed on the display unit 123.

  For example, the display control unit 122 performs the first driving described with reference to FIGS. 16 to 24 and causes the display unit 123 to display a high-density image.

  Next, a second driving method in which the display control unit 122 drives the subpixels 261 to 263 constituting the display unit 123 will be described with reference to FIGS. 31 to 49.

  As shown in FIG. 31, in the second driving method, in addition to the subpixel group 271 and the subpixel group 272 described with reference to FIG. 16, the subpixel group having a shape obtained by rotating the subpixel group 272 is used. In 301 and the sub-pixel group 302, one pixel of the high-density image is displayed.

  The subpixel group 301 is a ladder-shaped subpixel group including two subpixels 262 and one subpixel 261 and one subpixel 263. The subpixel group 302 includes two subpixels 263, and This is a group of sub-pixels that are formed by one subpixel 261 and one subpixel 262.

As shown in FIG. 31, in the second driving method, the display control unit 122 of FIG. 10, for example, sub-pixel 262 ₁₁ of the pixel cells 251 _11, sub-pixel cells 251 ₁₂ adjacent to the upper right of the pixel cells 251 ₁₁ pixel 261 ₁₂ and the sub-pixel 263 _12, and the respective sub-pixels of the sub-pixel group 301 consisting of the sub-pixels 262 ₁₃ of the pixel cells 251 ₁₃ adjacent to the lower right of the pixel cells 251 ₁₁ (under the pixel cell 251 _12), respectively Drive to display one pixel of high density image.

Incidentally, the sub-pixel groups 271 and the sub-pixel groups 301, when displaying the pixels of the same value, the blue luminance are respectively displayed on the sub-pixel 262 ₁₁ and the sub-pixel 262 ₁₃ is displayed on the sub-pixels 262 ₁ Half of the blue brightness. That is, the sum of the blue luminances displayed on the subpixel 262 ₁₁ and the subpixel 262 ₁₃ is equal to the blue luminance displayed on the subpixel 262 ₁ .

Further, as shown in FIG. 31, in the second driving method, the display control unit 122 of FIG. 10, for example, sub-pixel 262 ₁₄ and the sub-pixel 263 ₁₄ pixel cell 251 _14, as well as the upper right of the pixel cell 251 ₁₄ Each sub-pixel of the sub-pixel group 302 composed of the sub-pixel 261 ₁₅ and the sub-pixel 263 _{15 of the} adjacent pixel cell 251 ₁₅ is driven to display one pixel of the high-density image.

Incidentally, the sub-pixel groups 271 and the sub-pixel groups 302, when displaying the pixels of the same value, the red luminance displayed respectively on the sub-pixels 263 ₁₄ and the sub-pixel 263 _15, it is displayed on the sub-pixels 263 ₁ Half of the red brightness. That is, the sum of the red luminance displayed respectively on the sub-pixel 263 ₁₄ and the sub-pixel 263 ₁₅ is equal to the red luminance is displayed on the sub-pixels 263 _1.

In the following, if it is necessary to distinguish the plurality of sub-pixel groups 301 individually, each sub-pixel group 301 is called a sub-pixel group 301 _m, if it is necessary to distinguish the plurality of sub-pixel groups 302 each Each subpixel group 302 is referred to as a subpixel group 302 _m .

  In the second driving method, the display control unit 122 sequentially displays pixels in one of 16 patterns including a regular hexagonal subpixel group 271 and a ladder-shaped subpixel group 272, 301, 302. The high-density image is displayed on the display unit 123.

  Next, the second driving method will be specifically described with reference to FIGS. 32 to 47.

  Since the patterns in FIGS. 32 to 35 are the same as the patterns in FIGS. 17 to 20 described above, the description will be omitted to avoid repetition.

The display control unit 122, as shown in FIG. 35, after displaying the one pixel of the high density image, as shown in FIG. 36, the sub-pixels 261 ₅ and the sub-pixels 263 ₅ of the pixel cells 251 _5, the pixel cell 251 ₉ sub-pixels 262 ₉ , and each sub-pixel of the sub-pixel group 301 _{1 in} a ladder shape composed of sub-pixels 262 ₁₆ of pixel cells 251 ₁₆ adjacent to the lower left of pixel cell 251 ₅ (upper left of pixel cell 251 ₉ ) driven to display one pixel of a high density image on the sub-pixel group 301 _1. Here, the shape of the subpixel group 301 _{1 is} a shape obtained by rotating the subpixel group 272 ₁ of FIG. 33 by 120 degrees in the clockwise direction.

Next, as shown in FIG. 37, the display control unit 122 is a ladder shape including the subpixel 262 ₅ and the subpixel 263 ₅ of the pixel cell 251 ₅ , and the subpixel 261 ₇ and the subpixel 262 _{7 of the} pixel cell 261 _7. drives for each subpixel of the sub-pixel groups 301 _2, respectively, to display one pixel of a high density image on the sub-pixel groups 301 _2.

Further, the display control unit 122, as shown in FIG. 38, the pixel cell 251 subpixels 263 _{5 5,} sub-pixel 263 ₆ pixel cells 251 _6, and the pixel cells 251 subpixels 261 _{7 7} and the sub-pixels 262 ₇ tofu-type sub-pixel group 302 ₁ of each sub-pixel comprising a driving respectively, to display one pixel of a high density image on the sub-pixel group 302 _1. The shape of the subpixel group 302 _{1 is} a shape obtained by rotating the subpixel group 272 ₁ of FIG. 33 by 120 degrees counterclockwise.

Next, the display control unit 122, as shown in FIG. 39, the sub-pixels 262 ₇ and the sub-pixels 263 ₇ pixel cell 251 _7, and tofu type consisting of sub-pixels 261 ₈ and the sub-pixels 263 ₈ pixel cell 251 ₈ drives for each subpixel of the sub-pixel groups 302 _2, respectively, to display one pixel of a high density image on the sub-pixel groups 302 _2.

  In the second driving method, the display control unit 122 displays the pixels of the horizontal line # 1 of the high-density image on the display unit 123 by repeatedly driving the subpixels 261 to 263 as described above.

  The display control unit 122 displays the horizontal line #l of the high-density image, and then displays the pixels of the horizontal line # l + 1.

  Specifically, the display control unit 122 sequentially displays one pixel of the high-density image as shown in FIGS. Note that the patterns in FIGS. 40 to 43 are the same as the patterns in FIGS. 21 to 24 described above, and thus the description thereof will be omitted.

The display control unit 122, as shown in FIG. 43, after displaying the one pixel of the high density image, as shown in FIG. 44, the sub-pixels 263 ₅ of the pixel cells 251 _5, sub-pixel 261 of the pixel cell 251 _{9 9} and the sub-pixels 262 _9, and each sub-pixel of the pixel cell 251 ₁₆ subpixels 263 ₁₆ tofu-type sub-pixel groups 302 ₃ consisting of a driven, respectively, display one pixel of a high density image on the sub-pixel groups 302 ₃ Let

Next, the display control unit 123, as shown in FIG. 45, the sub-pixels 261 ₇ and the sub-pixels 263 ₇ pixel cell 251 _7, and tofu type consisting of sub-pixels 262 ₉ and the sub-pixels 263 ₉ pixel cells 251 ₉ driven sub-pixel group 302 ₄ of each sub-pixel, respectively, to display one pixel of a high density image on the sub-pixel groups 302 _4.

Further, the display control unit 122, as shown in FIG. 46, pixel cells 251 ₇ subpixels 261 ₇ and the sub-pixels 263 _7, sub-pixels 262 ₉ pixel cells 251 _9, and the pixel cells 251 ₇ under (pixel cell 251 ₉ of the lower right) to the respective sub-pixels of the sub-pixel 262 ₁₇ tofu-type sub-pixel group 301 ₃ consisting of the pixel cells 251 ₁₇ adjacent driven respectively, one pixel of the high density image on the sub-pixel group 301 ₃ Display.

Next, the display control unit 122, as shown in FIG. 47, tofu type consisting of sub-pixels 261 ₁₀ and the sub-pixel 262 ₁₀ subpixels 262 ₇ and the sub-pixels 263 _7, and pixel cells 251 ₁₀ of the pixel cell 251 ₇ drives for each subpixel subpixel group 301 _4, respectively, to display one pixel of a high density image on the sub-pixel groups 301 _4.

  By repeatedly driving the sub-pixels 261 to 263 as described above, the pixels of the horizontal line # l + 1 of the high-density image are displayed on the display unit 123.

Next, referring to FIG. 48, when the display control unit 122 drives each of the subpixels 261 to 263 by the second driving method, the subpixel groups 271, 272, 301 included in the pixel cell 251 ₇ or The center of gravity of 302 will be described.

  Since the sub-pixel group 301 and the sub-pixel group 302 have the same ladder shape as the sub-pixel group 271, the centroid of the sub-pixel group 301 and the sub-pixel group 302 is the centroid H of the sub-pixel group 271 (FIG. 28). At the same position.

As shown in FIG. 48, the pixel cell 251 ₇ includes a centroid A1 of the subpixel group 271 ₄ and a centroid A2 of the subpixel group 271 ₂ , and a centroid H1 of the subpixel group 272 ₂ and a centroid H2 of the subpixel group 272 ₃ . Besides, the center of gravity H3 and sub-pixel groups 301 ₄ of the center of gravity H4 subpixel group 301 _3, as well as the center of gravity H6 of the center of gravity H5 and sub-pixel group 302 _{and second} sub-pixel group 302 _1.

That is, the pixel cell 251 ₇ includes six centroids of the centroids H3 (H5), H1, A1, A2, H2, and H4 (H6) at different positions in the horizontal direction (left and right direction in the figure), and is vertical. Since the six centroids of the centroids H1 (A2), H5, H6, H2 (A1), H4, and H3 are included at different positions in the direction (vertical direction in the figure), the display control unit 122 uses the second driving method. When driving each of the subpixels 261 to 263, the high-density image displayed on the display unit 123 including the pixel cells 251 has a higher horizontal resolution than a conventional display device whose display is controlled in units of one pixel cell. The image is 6 times the vertical and vertical definition.

  In other words, the display unit 123 can display a high-density image whose horizontal resolution is 6 times dense and whose vertical resolution is 6 times dense. In this case, the high-density image generation unit 121 uses the horizontal direction based on an image (SD image) that is input from the tuner 111, the video player 112, or the PC 113 and that is suitable for display control in units of one pixel cell. A high-density image (HD image) having a resolution of 6 times higher and a vertical resolution of 6 times higher is generated.

  As described above, in the display device 101 of FIG. 15, when the display control unit 122 performs driving by the second driving method, it is displayed on the display unit 123 as compared to when driving by the first driving method. The resolution of the image can be further improved. As a result, the display device 101 can further improve the smoothness of the image displayed on the display unit 123.

  Next, a high-density image displayed on the display unit 123 when the display control unit 122 performs driving by the second driving method will be described with reference to FIG. In FIG. 49, a high-density image of the character “0” is displayed on the display unit 123.

  When the display control unit 122 is driven by the second driving method, the display device 101 has a horizontal definition and a vertical definition of 6 times that of the conventional display device whose display is controlled in units of one pixel cell. A high-density image is displayed. Therefore, as shown in FIG. 49, the smoothness of the image displayed on the display device 101 is improved as compared with the image of FIG. 6 displayed on the conventional display device whose display is controlled in units of one pixel cell. Yes.

  Further, the image of FIG. 7 displayed on the display device whose display is controlled in units of sub-pixels 11 to 13 (FIG. 1) capable of displaying an image having a horizontal resolution of 3 times, or the vertical and horizontal definition. Compared with the image of FIG. 8 or FIG. 9 displayed on a display device whose display is controlled in units of subpixels 31 to 33 (FIG. 4) or subpixels 51 to 53 (FIG. 5) capable of displaying a double image. However, the smoothness of the image displayed on the display device 101 shown in FIG. 49 is improved.

  As shown in FIG. 49, the high-density image of the character “0” displayed on the display unit 123 includes a portion displayed by the sub-pixel 321 protruding like a cocoon. However, the subpixel 321 is a subpixel included in any of the subpixel groups 252, 301, or 302. Therefore, the luminance of the color displayed on the subpixel 321 is half the luminance of the color displayed on the subpixels 261 to 263 constituting the subpixel group 251, and the color displayed on the subpixel 321 is not noticeable. As a result, the high-density image of the character “0” displayed on the display unit 123 becomes a natural curved image.

  FIG. 50 is a block diagram showing a configuration example of the second embodiment of the display device to which the present invention is applied. In the figure, parts corresponding to those in FIG. 10 are denoted by the same reference numerals.

  50, a display control unit 351 and a display unit 352 are provided instead of the display control unit 122 and the display unit 123. Based on the image data of the high-density image supplied from the high-density image generation unit 121, the display control unit 351 independently drives a plurality of subpixels constituting the display unit 352 to display a high-density image.

  The display unit 352 includes a plurality of pixel cells including six subpixels having a regular triangular shape. The display control unit 351 drives the sub-pixels of the display unit 123 to display red, green, blue, yellow, magenta, or cyan on the sub-pixels. As a result, a high-density image is displayed on the display unit 352.

  FIG. 51 shows an example of a pixel cell constituting the display unit 352 of FIG. In the figure, R, G, B, C, M, and Y represent red, green, blue, cyan, magenta, and yellow, respectively.

  As shown in FIG. 51, the pixel cell 401 is composed of sub-pixels 411 to 416 having the same size and regular triangular shape. Here, the size of each of the subpixels 411 to 416 is half the size of the diamond-shaped subpixels 261 to 263 of the pixel cell 251 in FIG. In the pixel cell 401, the subpixels 411 to 416 are in different directions (lines perpendicular to the base of the equilateral triangle point in directions of 30 degrees, 90 degrees, 150 degrees, 210 degrees, 270 degrees, or 330 degrees). The pixel cells 401 have a regular hexagonal shape.

  The display unit 352 in FIG. 50 includes a plurality of pixel cells 401, and the display control unit 351 is based on the high-density image image data from the high-density image generation unit 121, and the subpixels 411 to 416 of the display unit 352. The subpixel 411 displays green, the subpixel 412 displays cyan, the subpixel 413 displays blue, the subpixel 414 displays magenta, the subpixel 415 displays red, and the subpixel 416 displays yellow. Accordingly, a multi-color high-density image is displayed on the display unit 352.

In the following description, when distinguishing the plurality of pixel cells 401, each pixel cell 401 of the pixel cell 401 _m. The subpixels 411 to 416 constituting the pixel cell 401 _m are referred to as subpixels 411 _{m to} 416 _m .

  Next, a third driving method in which the display control unit 351 drives the subpixels 411 to 416 constituting the display unit 352 will be described with reference to FIGS. The third driving method is generally similar to the first driving method described with reference to FIGS. 16 to 30, but becomes complicated as the number of subpixels 411 to 416 constituting the pixel cell 401 increases. ing.

That is, in the third driving method, the shape of the gathering of the sub-pixels 411 to 416 that display one pixel of the high-density image is only horizontally reversed. In addition, there are three types of color arrangement of the regular hexagonal subpixels 411 to 416 (the types of color arrangement of the regular hexagonal subpixels 411 to 416 shown in FIGS. 53, 56, and 59 described later). ). Furthermore, tofu shaped right array of color collection of sub-pixels 411 to 416 (the shape of tofu-type sub-pixel groups 272 ₁ shown in FIG. 18) is three (described below FIG. 55, FIG. 58, and FIG. 61, the color arrangement of the group of gathered sub-pixels 411 to 416 shown in FIG. 61, and the color array of the gathered group of sub-pixels 411 to 416 of the left-facing ladder (the shape of the ladder shown in FIG. 19). Are three types (types of color arrangement of gathered sub-pixels 411 to 416 shown in FIGS. 54, 57, and 60 described later).

As shown in FIG. 52, in the third driving method, the display control unit 351 in FIG. 50 drives, for example, the sub-pixels 411 _{1 to} 416 ₁ of the pixel cell 401 ₁ independently to each pixel of the high-density image. Is displayed. Hereinafter, a group of regular hexagonal subpixels 411 to 416 that display one pixel of a high-density image is referred to as a subpixel group 421. For example, in FIG. 52, the subpixel group 421 includes subpixels 411 _{1 to} 416 ₁ .

The display control unit 351, for example, sub-pixel 413 ₂ - 416 ₂ pixel cell 401 _2, and the sub-pixel 411 ₃ to 414 ₃ pixel cell 401 ₃ adjacent to the bottom of the pixel cell 401 _2, driven respectively One pixel of the high-density image is displayed.

In the following description, two subpixels 413 and 414, and a group of one subpixel 411, 412, 415, and 416, two subpixels 412 and 415, and one subpixel 411, 413, and 416 are collected. A group of 414 and 416 or a group of two subpixels 411 and 416 and one subpixel 412 to 415 is referred to as a subpixel group 422. For example, in FIG. 52, the sub-pixel group 422 includes sub-pixels 413 _{2 to} 416 ₂ and 411 _{3 to} 414 ₃ .

  When the subpixel group 421 and the subpixel group 422 display pixels having the same value, the subpixel group 421 displays two subpixels that display the same color among the subpixels 411 to 416 included in the subpixel group 422. The luminance of the color to be displayed is half of the luminance of the color displayed by the subpixel displaying the corresponding color of the subpixels 411 to 416 included in the subpixel group 421.

Hereinafter, when a plurality of subpixel groups 421 need to be individually distinguished, each subpixel group is referred to as 421 _m, and when a plurality of subpixel groups 422 needs to be individually distinguished, The group 422 is referred to as a subpixel group 422 _m .

  In the third driving method, the display control unit 351 causes the display unit 352 to display each pixel constituting the high-density image on the regular hexagonal sub-pixel group 421 or the ladder-shaped sub-pixel group 422, thereby causing the display unit 352 to display the high-density image. Is displayed.

Specifically, in the third driving method, for example, as shown in FIG. 53, the display control unit 351 first includes a regular hexagonal subpixel composed of the subpixels 411 _{4 to} 416 ₄ of the pixel cell 401 _4. driven independently of each sub-pixel group 421 _1, the sub-pixel groups 421 _1, displays one pixel of the high density image.

Next, the display control unit 351, as shown in FIG. 54, the sub-pixels 412 ₄ to 415 ₄ of the pixel cell 401 _4, sub-pixel 415 ₅ of the pixel cell 401 ₅ adjacent to the upper side of the pixel cells 401 _4, pixel cells 401 ₄ subpixels 412 ₆ pixel cells 401 ₆ adjacent to the lower subpixel 416 ₇ pixel cells 401 ₇ adjacent to the upper right of the pixel cell 401 _4, and the pixel cells 401 ₄ lower right (pixel cells 401 ₇ each sub-pixel of the sub-pixel groups 422 ₁ of tofu-type consisting of the sub-pixels 411 ₈ pixel cell 401 ₈ adjacent to the bottom) driven respectively, the sub-pixel groups 422 _1, displays one pixel of the high density image.

Then, the display control unit 351, as shown in FIG. 55, the sub-pixels 412 ₄ to 415 ₄ of the pixel cell 401 _4, sub-pixel 411 ₇ and the sub-pixels 416 ₇ pixel cell 401 _7, and the sub-pixel cells 401 ₈ Each of the sub-pixels of the ladder-shaped sub-pixel group 422 _{2 including} the pixel 411 ₈ and the sub-pixel 416 ₈ is driven to display one pixel of the high-density image on the sub-pixel group 422 ₂ .

Next, the display control unit 351, as shown in FIG. 56, the sub-pixels 413 ₄ and the sub-pixel 414 ₄ pixel cell 401 _4, sub-pixel 415 ₇ and the sub-pixels 416 ₇ pixel cell 401 _7, and pixel cells 401 ₈ subpixels 411 ₈ and the sub-pixels 412 ₈ regular hexagon of each sub-pixel of the sub-pixel groups 421 ₂ consisting of a driven respectively, to display a pixel of the high density image on the sub-pixel groups 421 _2.

Then, the display control unit 351, as shown in FIG. 57, the pixel cells 401 ₇ subpixels 411 _7, and 414 ₇ to 416 _7, as well as sub-pixels 411 ₈ to 413 ₈ of the pixel cells 401 ₈ and 416 _8, Each of the sub-pixel groups 422 ₃ is driven, and one pixel of the high-density image is displayed on the sub-pixel group 422 ₃ .

Next, the display control unit 351, as shown in FIG. 58, pixel cells 401 ₇ subpixels 413 ₇ to 416 _7, and tofu-shaped sub-pixel groups consisting of the sub-pixels 411 ₈ to 414 ₈ of the pixel cell 401 ₈ Each of the subpixels 422 ₄ is driven to display one pixel of the high-density image in the subpixel group 422 ₄ .

Then, the display control unit 351, as shown in FIG. 59, the sub-pixels 414 ₇ and the sub-pixels 415 ₇ pixel cell 401 _7, sub-pixels 412 ₈ and the sub-pixels 413 ₈ pixel cell 401 ₈ and the pixel cells 401 _7, the lower right driven (pixel cell 401 ₈ top right) in the respective sub-pixels of the sub-pixels 411 ₉ and the regular hexagon of the sub-pixel groups 421 ₃ consisting of the sub-pixels 416 ₉ pixel cells 401 ₉ respectively adjacent sub-pixel groups One pixel of the high-density image is displayed on 421 ₃ .

Next, the display control unit 351, as shown in FIG. 60, the sub-pixels 413 ₇ and the sub-pixels 414 ₇ pixel cell 401 _7, sub-pixels 413 ₈ and the sub-pixels 414 ₈ pixel cell 401 _8, and the pixel cells 401 Each of the sub-pixel groups 422 ₅ of the _nine sub-pixels 411 ₉ , 412 ₉ , 415 ₉ , and 416 ₉ is driven to display one pixel of the high-density image on the sub-pixel group 422 ₅ . .

Then, the display control unit 351, as shown in FIG. 61, the sub-pixels 414 ₇ pixel cell 401 _7, sub-pixels 413 ₈ pixel cell 401 _8, the sub-pixels 411 ₉ pixel cells 401 _9, 412 _9, 415 ₉ , and 416 _9, sub-pixel 415 ₁₀ of the pixel cells 401 ₁₀ adjacent to the upper side of the pixel cell 401 ₉ and tofu-type sub-pixels consisting of the sub-pixels 412 ₁₁ of the pixel cells 401 ₁₁ adjacent the bottom of the pixel cell 401 ₉ each sub-pixel group 422 ₆ driven respectively, to display a pixel of the high density image on the sub-pixel groups 422 _6.

  In the third driving method, the display control unit 351 causes the display unit 352 to display the pixels of the horizontal line # 1 of the high-density image by repeatedly driving the subpixels 411 to 416 as described above. Thereafter, the display control unit 351 displays the pixels of the horizontal line # l + 1 of the high-density image.

Specifically, as shown in FIG. 62, the display control unit 351, the sub-pixels 413 ₄ to 416 ₄ of the pixel cell 401 _4, as well as tofu type consisting of sub-pixels 411 ₆ to 414 ₆ pixel cells 401 ₆ sub driving each sub-pixel of a pixel group 422 ₇ respectively, the sub-pixel groups 422 ₇ to display one pixel of the high density image.

Next, the display control unit 351, as shown in FIG. 63, pixel cells 401 ₄ subpixels 414 ₄ and the sub-pixel 415 _4, sub-pixel 412 ₆ and the sub-pixels 413 ₆ pixel cells 401 _6, and the pixel cells 401 ₈ subpixels 411 ₈ and a regular hexagon sub-pixel groups consisting of the sub-pixels 416 ₈ 421 ₄ subpixel driven respectively, the sub-pixel groups 421 ₄ displays one pixel of the high density image.

Then, the display control unit 351, as shown in FIG. 64, the sub-pixels 413 ₄ and the sub-pixel 414 ₄ pixel cell 401 _4, sub-pixel 413 ₆ and the sub-pixels 414 ₆ pixel cells 401 _6, and the pixel cells 401 ₈ subpixel 411 _8, 412 _8, 415 _8, and 416 of ₈ tofu shaped sub-pixel groups 422 ₈ consisting of the respective sub-pixels driven respectively, to display a pixel of the high density image on the sub-pixel groups 422 _8.

Next, the display control unit 351, as shown in FIG. 65, the sub-pixels 414 ₄ pixel cell 401 _4, sub-pixel 413 ₆ pixel cells 401 _6, sub-pixels 415 ₇ pixel cell 401 _7, pixel cell 401 ₈ subpixel 411 _8, 412 _8, 415 _8, and 416 _8, and each sub-pixel of tofu-type sub-pixel group 422 ₉ of subpixels 412 ₁₂ pixel cell 401 ₁₂ adjacent the bottom of the pixel cell 401 ₈ Each is driven to display one pixel of the high-density image in the sub-pixel group 422 ₉ .

Then, the display control unit 351, as shown in FIG. 66, to drive each respective sub-pixels of the regular hexagon of the sub-pixel groups 421 ₅ consisting of the sub-pixels 411 ₈ to 416 ₈ of the pixel cells 401 _8, the sub-pixel groups 421 ₅ displays one pixel of the high-density image.

Next, the display control unit 351, as shown in FIG. 67, the sub-pixels 415 ₇ pixel cell 401 _7, sub-pixels 412 ₈ to 415 ₈ of the pixel cells 401 _8, the sub-pixels 416 ₉ pixel cells 401 _9, the pixel cell 401 subpixels 411 _{11 11,} and each sub-pixel of tofu-type sub-pixel groups 422 ₁₀ consisting of the sub-pixels 412 ₁₂ pixel cell 401 ₁₂ drives each pixel of the high density image on the sub-pixel groups 422 ₁₀ Is displayed.

Then, the display control unit 351, as shown in FIG. 68, the sub-pixels 412 ₈ to 415 ₈ of the pixel cells 401 _8, the sub-pixels 411 ₉ and the sub-pixels 416 ₉ pixel cells 401 _9, and the sub-pixel cells 401 ₁₁ respectively driving each sub-pixel of a pixel 411 ₁₁ and the sub-pixels 416 of tofu-type consisting of ₁₁ sub-pixel groups 422 ₁₁ to display one pixel of a high density image on the sub-pixel groups 422 _11.

Next, the display control unit 351, as shown in FIG. 69, the sub-pixels 413 ₈ and the sub-pixels 414 ₈ pixel cell 401 _8, the sub-pixels 415 ₉ and the sub-pixels 416 ₉ pixel cells 401 _9, the pixel cells 401 ₁₁ Each of the sub-pixels of the regular hexagonal sub-pixel group 421 ₆ composed of the sub-pixel 411 ₁₁ and the sub-pixel 412 ₁₁ is driven to display one pixel of the high-density image on the sub-pixel group 421 ₆ .

Then, the display control unit 351, as shown in FIG. 70, consisting of the sub-pixels 411 ₉ and 414 ₉ to 416 _9, and the sub-pixels 411 ₁₁ to 413 ₁₁ and 416 ₁₁ of the pixel cells 401 ₁₁ of the pixel cell 401 ₉ tofu Each subpixel of the shape subpixel group 422 ₁₂ is driven to display one pixel of the high-density image in the subpixel group 422 ₁₂ .

  By repeatedly driving the sub-pixels 411 to 416 as described above, the pixels of the horizontal line # l + 1 of the high-density image are displayed on the display unit 352.

  Since the subpixel group 421 in FIG. 52 is a regular hexagon, the center of gravity of the subpixel group 421 exists at the same position as the center of gravity A of the subpixel group 271 (FIG. 25). Further, since the sub-pixel group 422 has a ladder shape, the center of gravity of the sub-pixel group 422 exists at the same position as the center of gravity H of the sub-pixel group 271 (FIG. 28).

  Therefore, although not shown, when the display control unit 351 performs driving by the third driving method, the pixel cell 401 in FIG. 51 includes nine centroids in the horizontal direction and two centroids in the vertical direction. It is. As a result, the high-density image displayed on the display unit 352 has an image with 9 times the horizontal definition and 2 times the vertical definition compared to a display device in which display is controlled in units of a conventional pixel cell. It becomes.

  As described above, the size of each of the sub-pixels 411 to 416 of the pixel cell 401 constituting the display unit 352 in FIG. 50 is half the size of each of the sub-pixels 261 to 263 in FIG. Compared with the driving method, a larger number of sub-pixel groups 421 or 422 for displaying one pixel of a high-density image can be arranged on the display portion 352. That is, the pixel cell 401 includes the centroid of more pixels than the pixel cell 251. As a result, the display device 350 can display a smoother image than the display device 101 of FIG.

  52 to 70, the third driving method corresponding to the first driving method has been described. However, the display control unit 351 corresponds to the second driving method described with reference to FIGS. 31 to 49. The driving method 4 can also be performed. In this case, the display unit 352 can display a smoother image as compared with the case where driving is performed by the third driving method.

  By the way, human vision has a direction. For example, it is easier for humans to recognize vertical and horizontal stretched areas as diagrams compared to diagonally stretched areas (Yoda Wada, Tadashi Oyama, Sho Imai “Sensual and Perceptual Psychology Handbook”, Seishin Shobo , P.469 “Rubin, Visuell wahrgenommene Figuren.Copenhagen: Gyldendalske, 1921”).

  Therefore, a pixel having a shape composed of vertical or horizontal lines is more easily recognized as a figure by a human and a pixel shape is more conspicuous than a pixel having a shape including an oblique line. That is, the pixels displayed in the regular hexagonal subpixel group 271 or 421 including the diagonal line, or the ladder subpixel group 272, 301, 302, or 422 are the pixel pixels of the conventional pixel cell 1 (21 , 41) rectangular subpixels 11 to 13 (31 to 33, 51 to 53) constituted by vertical or horizontal lines are driven, and the shape of the pixels is less noticeable than the pixels displayed. .

  In other words, a regular hexagonal subpixel group 271 or 421 or a ladder-shaped subpixel group 272, 301, 302, or 422 that displays one pixel of a high-density image is a conventional pixel cell 1 (21, 41). Even when the size is larger than the three subpixels 11 to 13 (31 to 33, 51 to 53) that display one pixel, the roughness of the pixels of the high-density image displayed on the display unit 123 or 352 is small. Inconspicuous.

  Therefore, when an image having the same image quality as that of a conventional display device is displayed, the need for semiconductor miniaturization is reduced as compared with the conventional display device. As a result, there is an advantage that the cost required for miniaturization of the semiconductor can be reduced.

  Further, when displaying an image having the same image quality as that of the conventional display device, the size of the subpixels 261 to 263 or 411 to 416 may be larger than that of the conventional display device. Each of the subpixels 261 to 263 or 411 to 416 includes a light emitting unit that emits light and a circuit unit that drives the light emitting unit, and it is generally difficult to make the circuit unit smaller than a predetermined size. Accordingly, the smaller the size of the subpixels 261 to 263 or 411 to 416, the lower the aperture ratio, which is the ratio of the area of the light-transmitting region through which the light is transmitted to the overall size of the subpixels 261 to 263 or 411 to 416. The luminance of the color displayed in the subpixels 261 to 263 or 411 to 416 is reduced.

  As described above, when the size of the subpixels 261 to 263 or 411 to 416 is sufficient, the aperture ratio does not decrease, and the luminance of the color displayed in the subpixels 261 to 263 or 411 to 416 does not decrease. Moreover, since the aperture ratio does not decrease, it is possible to prevent power consumption from being deteriorated by the light source of the light emitting unit.

  Note that the colors displayed in the subpixels 411 to 416 in FIG. 51 are not limited to the above-described green, cyan, blue, magenta, red, or yellow. For example, when white is included in the colors displayed in the subpixels 411 to 416, the luminance of the pixels of the high-density image can be improved.

  Further, as described above, the display control unit 122 (351) drives the sub-pixels 261 to 263 (411 to 416), and sets the pixels constituting the high-density image for each pixel (each pattern described above). In addition to displaying, all the pixels constituting the high-density image may be displayed simultaneously. When displaying all the pixels constituting the high-density image at the same time, the display control unit 122, for each of the sub-pixels 261 to 263 (411 to 416), includes a plurality of sub-pixel groups 271, 272, 301 or 302 (421, 422) is integrated with the pixel value of each pixel, and each subpixel 261 to 263 (411 to 416) is normalized by the maximum pixel value that can be displayed. The pixels 261 to 263 (411 to 416) emit light of each color.

  As described above, in the display device 101 in FIG. 10, a plurality of rhombus-shaped subpixels 261 to 263 are driven to drive the subpixels 261 to 263 of the display unit 123 arranged so as to be adjacent to each other in different directions. Since the high-density image is displayed on the display unit 123, a smooth image can be displayed on the display unit 123.

  In the display device 350 of FIG. 50, the subpixels 411 to 416 of the display portion 352 are arranged so that the plurality of equilateral triangular subpixels 411 to 416 are adjacent to each other in different directions. Since the display unit 352 is driven in units of sub-pixel groups 421 or 422 so as to have colors and a high-density image is displayed on the display unit 352, a smooth image can be displayed on the display unit 352.

  Here, in this specification, the processing steps for describing a program for causing a computer to perform various types of processing do not necessarily have to be processed in time series according to the order described in the flowchart, but in parallel or individually. This includes processing to be executed (for example, parallel processing or processing by an object).

It is a figure which shows the shape of the pixel cell which comprises the conventional display apparatus. It is a figure which shows the example of the image displayed in the display apparatus comprised from the pixel cell of FIG. It is a figure which shows the example of the image displayed in the display apparatus comprised from the pixel cell of FIG. It is a figure which shows the other shape of the pixel cell which comprises the conventional display apparatus. It is a figure which shows other shape of the pixel cell which comprises the conventional display apparatus. It is a figure which shows the image displayed on the display apparatus comprised from the pixel cell of an RGB stripe arrangement | sequence. It is a figure which shows the image displayed on the display apparatus comprised from the pixel cell of an RGB stripe arrangement | sequence. It is a figure which shows the image displayed on the display apparatus comprised from the pixel cell of a checkered arrangement | sequence. It is a figure which shows the image displayed on the display apparatus comprised from the pixel cell of a delta arrangement | sequence. It is a block diagram which shows the structural example of 1st Embodiment of the display apparatus to which this invention is applied. It is a block diagram which shows the structure of a high-density image generation part. It is a figure explaining the tap structure of a class tap and a prediction tap. It is a block diagram which shows the structural example of the function of a calculation part. It is a block diagram which shows the structural example of a learning part. It is a figure which shows the example of the pixel cell which comprises a display part. It is a figure explaining the 1st drive method. It is a figure explaining the 1st drive method. It is a figure explaining the 1st drive method. It is a figure explaining the 1st drive method. It is a figure explaining the 1st drive method. It is a figure explaining the 1st drive method. It is a figure explaining the 1st drive method. It is a figure explaining the 1st drive method. It is a figure explaining the 1st drive method. It is a figure explaining the gravity center of a subpixel group. It is a figure explaining the gravity center of a subpixel group. It is a figure explaining the gravity center of a subpixel group. It is a figure explaining the gravity center of a subpixel group. It is a figure explaining the gravity center contained in a pixel cell. It is a flowchart explaining a display process. It is a figure explaining the 2nd drive method. It is a figure explaining the 2nd drive method. It is a figure explaining the 2nd drive method. It is a figure explaining the 2nd drive method. It is a figure explaining the 2nd drive method. It is a figure explaining the 2nd drive method. It is a figure explaining the 2nd drive method. It is a figure explaining the 2nd drive method. It is a figure explaining the 2nd drive method. It is a figure explaining the 2nd drive method. It is a figure explaining the 2nd drive method. It is a figure explaining the 2nd drive method. It is a figure explaining the 2nd drive method. It is a figure explaining the 2nd drive method. It is a figure explaining the 2nd drive method. It is a figure explaining the 2nd drive method. It is a figure explaining the 2nd drive method. It is a figure explaining the gravity center contained in a pixel cell. It is a figure which shows the high-density image displayed on a display part. It is a block diagram which shows the structural example of 2nd Embodiment of the display apparatus to which this invention is applied. The example of the pixel cell which comprises a display part is shown. It is a figure explaining the 3rd drive method. It is a figure explaining the 3rd drive method. It is a figure explaining the 3rd drive method. It is a figure explaining the 3rd drive method. It is a figure explaining the 3rd drive method. It is a figure explaining the 3rd drive method. It is a figure explaining the 3rd drive method. It is a figure explaining the 3rd drive method. It is a figure explaining the 3rd drive method. It is a figure explaining the 3rd drive method. It is a figure explaining the 3rd drive method. It is a figure explaining the 3rd drive method. It is a figure explaining the 3rd drive method. It is a figure explaining the 3rd drive method. It is a figure explaining the 3rd drive method. It is a figure explaining the 3rd drive method. It is a figure explaining the 3rd drive method. It is a figure explaining the 3rd drive method. It is a figure explaining the 3rd drive method.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 101 Display apparatus, 121 High density image generation part, 122 Display control part, 123 Display part, 251 Pixel cell, 261 thru | or 263 subpixel, 271,272,301,302 Subpixel group, 350 Display apparatus, 351 Display control part, 352 display unit, 401 pixel cell, 411 to 416 subpixels, 421,422 subpixel group

Claims (11)

Display means in which a plurality of rhombus-shaped display elements are arranged adjacent to each other in different directions;
Display control means for driving each display element independently and displaying the image on the display means ,
The display control means includes a unit of a hexagonal first display element group constituted by three adjacent display elements and a unit of a second display element group constituted by four adjacent display elements. A display device that drives a display element to display the image on the display means. The shape of the second display element group is a bowl shape.
The display device according to claim 1. It said display control means, by displaying different colors for the display elements of the first display element group, the display device according to claim 1, characterized in that for displaying the image on the display means. The plurality of first display element groups, the plurality of second display element groups, or the first display element group and the second display element group include at least one identical display element. The display device according to claim 1 . Image generation means for generating higher resolution image data based on the input image data;
The display device according to claim 1, wherein the display control unit causes the display unit to display the image based on high-resolution image data generated by the image generation unit. The display element is constituted by a small display element which is a display element having two triangular shapes.
The display device according to claim 1. The shape of the second display element group is a bowl shape.
The display device according to claim 6. The display control means displays the image on the display means by displaying different colors on the small display elements of the first display element group.
The display device according to claim 6. The plurality of first display element groups, the plurality of second display element groups, or the first display element group and the second display element group include at least one same small display element.
The display device according to claim 6. Image generation means for generating higher resolution image data based on input image data
Further comprising
The display control means causes the display means to display the image based on high resolution image data generated by the image generation means.
The display device according to claim 6. In a display control method of a display device including a plurality of rhombus-shaped display elements arranged so as to be adjacent to each other in different directions,
A display control step of driving to display an image of the display elements independently seen including,
In the display control step, the unit of the hexagonal first display element group constituted by the three adjacent display elements and the unit of the second display element group constituted by the four adjacent display elements are described above. A display control method , comprising: driving a display element to display the image on the display device .

Images